Typewriting device



22, 194.. K DIETRICH TYPEWRITING DEVICE Filed Dec. 9. 1940 2 Sheets-Sheet 1 mow@ Dec. 22, 1942. K DIETRICH 2,3%753 TYPEWRITING DEVICE Filed De'c. 9, 1940 2 Sheets-Sheet 2 Patented Dec. 22, 1942 TYPEWRITING DEVICE Karl Dietrich, Hanover, Get-any; vested in the Alien Property Custodian Application December 9, 1940, Serial No. 369,333

Germany March 23, 1939 4 Claims.

The object of the invention is a device for writing of characters which are not comprised in ordinary writing. Such characters are, in particular, Greek letters. types for mathematical formulae, for foreign currency, etc. The invention is based upon the idea of providing a supplementary device for typewriters which can be easily attended, is always ready for use, and can be disconnected by one single manipulation, besides, having a simple construction as well as a low price. It also is a feature of the invention that the supplementary device can be used for typewriters of different make, thus without regard to whether the dimensions of the typewriter are larger or smaller.

In the accompanying drawings is Fig. 1 a side View, partly the section through a typewriter of usual construction and, attached to it, the supplementary device for typing of characters not comprised in ordinary writing;

Fig. 2 the plan view of a part of the supplementary device;

Fig. 3 a view in the direction of the arrow DI of Fig. 2;

Fig. 4 a section to the line IV-IV of Fig. 1; Fig. 5 an enlarged central section through the supplementary device;

Fig. 6 is a front view, partly the section to the line VI-VI of Fig. 5;

Fig. 7 the view of a part of the supplementary device in the direction of the arrow VII of Fig. 5.

A typewriter I9 with a key-board II of the generally used design has the front feet I2 and the rear feet I3. To the rear feet I3, a bearing block I4 is attached through the fundamental plates I5, I6 of which have holes II through which the bolts I8 of the rear feet I3 of the typewriter are inserted. Upon the bearing block I4, reposes the arm I9 having a basket 99 vwith type bars provided with characters which do not appear in ordinary writing, f. i.: a, ,fy, a, e, ,44, A, 'l'.

The arm I9 is revoluble in the column 29. A pin 2I of the arm I9 has, at its lower end, a nut 22 and a washer 23. A pressure spring 24 is, at its one end, in contact with the washer 23 and, at its other end, with a shoulder 25 of the column 29. The arm I9 is, at the point of its transition towards the pin 2l, enlarged as to form the ring 29 which is carried by the upper front face of the column 29. The ring 28 has the nose 21. The column 29 comprises, at its front face, a revolving' ring 45 to be tightened by means of the screw 44, this ring having two diametrically opposel notches 28, 29 into which the 55 nose 2'Iv is adapted to engage. The notches 28, 29 serve to iix the arm I9 in the workilng positino I9 or in the position of rest I9 of Fig. 1. The column 29 ends below in the plate 39 which comprises the slots 3l. Below the plate 39 is a further plate 32 which is supported by the bearing block I4. The guide rails 33 are fastened to the bearing block I4 by means of the screws 34. The rails 33 serve to guide the plate 32 which can be shifted from the left to the right and vice versa according to Figs. 1 and 2. Within the bearing block I4, the conical recesses 35 are arranged intc which the balls 38 are adapted to enter; the latter are movable vertically `within bores 31 of the plate 32 and are loaded by a platform-spring 38 which is fastened to the plate 32 by the screws 39. In the position according to Figs. 1 and 2, the plate 32 is, consequently, fixed on the bearing block I4 by the springloaded balls 36 which engage the recesses 35 in a spring-suspended manner. In spite thereof, the plate 32 can be shifted, however, a certain force is required to do so. The plate 39 of the column 29 can be rigidly attached to the plate 32 by the screws 49 by means of which the plates 39 and 32 can be tightened together. It emanates herefrom that the supplementary device which consists of the basket 99, the arm I9 and the column 29, can be removed by theuser of the typewriter by a backward pressure. If the supplementary device is to remain temporarily out of action, it can also be wheeled backwards by turning the arm I9 with the pin 2| in the column 29, whereby the nose 2'I disengages the recess 29 and, after a turning of 180, enters the recess 28.

The height of the basket 99 can be adjusted in relation to the typewriter I9. This purpose is met by the fastening of the basket 99 on the arm I9 by means of the screws 4I which are screwed into the basket 99 and pierce through the slot 42 of a tongue 43 wherein the arm I9 ends.

'I'he basket 99 has the bottom 46 into which the pin 41 of a hollow column 48 is screwed. Within the column is a pressure spring 49 tending to press outwardly the key 59 sliding within the column 48. 'I'he key 59 ends in a disc 5I which, when touching a type bar, is operated by a iinger. When pressing upon the disc 5I, the latter reaches the position 5I the spring 49 being I compressed. The key 59 is provided with the lateral ledge 52 having a slant face 53. The column 48 comprises a slot 94 which allows the ledge 52 to be displaced up'to the position 52' when pressure is exerted upon the disc 5I.

Upon the column 48, is the ball bearing 55 carrying the disc 56 to which 'a selective disc 60 is rigidly connected by means of the stays 61, the intermediate disc 66, and the stays 69. Upon the selective disc, the characters are marked which can be written by means of the supplementary device 90, t. i.: a, 7, 6, e, y, p, A, A.' 1r. Upon the disc 56, a number of type bars 6I are arranged star-shaped in such a manner that the type bars can be slewed inradial planes. One type bar 6I each is supported by a block 62. All blocks 62 are fixed to the disc 66 by means of screws 63. 'I'he type bar 6I to be seen in Fig. 5 is revoluble upon the pin 64. Each type bar comprises a toothed wheel segment 65 engaging the toothed rack 66. The latter is fastened to a sleeve 61 adapted to slide upon a bolt 68 which is rigid within the block 62. The sleeve 61 contains a pressure spring 69 tending to remove the sleeve 61 from the bolt 68, i. e. to turn the type bar 6| in a sense opposite to that of a watch hand. The slant face 63 of the ledge 52 on the key 50 is adapted to displace one of the sleeves 61 upon the pins 68, that way that the toothed rack 66 fastened to the sleeve 61 turns the type bar 6I in the sense of a watch hand. As the key 50 cannot be turned and, consequently, the ledge 52 is always below, always that type bar 6I which is just below will be slewed into the position 6I' by the ledge 62. As to which type bar is caused to touch, this depends upon the position of the `disc 56 which can be turned to ones liking by means of the selective disc 60. A hand 82 is fixed to the column 48 in order to facilitate the selection. The above described parts of the supplementary device 90 are surrounded by a casing in two parts 1li, 1I which, in its lower part, has a slot 12 through which the type bars 6I can protrude in outward direction so that the type bars 6i' touch the paper 13 upon the typewriter platen 14. The type bars 6| comprise, at their outer end, a prolongation 15. When touching the type bar, this prolongation enters the guide 16 with which typewriters are ordinarily provided to guide the normal type bars.

In order to assure that the type bars 6I exactly enter the prescribed touching position, the hereafter described stop device is provided. Upon the column 48, by means of the screw 11, the disc 18 is xed having notches 19 the number of which is equal to the number of type bars 6|. The ball 80 is displaced with the revolving disc 56 which ball is loaded by the pressure spring 8l. The ball 80 always catches into one notch 19 when one of the type bars 6I is exactly in the touching position.

The bolt 68 is fastened in the block 62 at 63. A bore 85 guiding the sleeve 61 is in the ange 84 of the block. The cap-screw 81 is screwed into the stay 86 of the block 62. This screw serves as a stop to limit the movement of the type bar 6l.

atomes I claim: 1. The combination of a typewriter having a platen carriage and a platen mounted therein, a

cylindrica1 basket revolving around a horizontal axis and arranged above the platen carriage of the typewriter, said basket comprising type bars having characters diilerent from those of the typewriter, the type bars being radially arranged in the basket, a key centrally arranged 'in the basket, and means operatively connected to the key to cause the lowest type bar to be moved to strike the platen in printing position.

2. 'Ihe combination of a typewriter having a platen carriage and a platen mounted therein, a cylindrical basket revolving around a horizontal axis and arranged above the platen carriage of the typewriter, said' basket comprising type bars having characters different from those of the typewriter, the type bars being radially arranged in the basket, a key centrally arranged in the basket, and means operatively connected to the key to cause the lowest type bar to be moved to strike the platen in printing position, the basket being attached to an arm which is adapted to be wheeled around a vertical axis behind the typewriter.

3. The combination of a typewriter having a platen carriage and aplaten mounted therein, a cylindrical basket revolving around a horizontal axis and arranged above the platen carriage of the typewriter, said basket comprising type bars having characters different from those of the typewriter, the type bars being radially arranged in the basket, a key centrally arranged in the basket, and means operatively connected to the key to cause the lowest type bar to be moved to strike the platen in printing position, the basket being attached to an arm which is adapted to be Wheeled around a vertical axis behind the typewriter, and the height position of which is adjustable in relation to the said arm, the arm having a horizontal adjustability and being fastened upon a base plate which is rigidly xed to the feet of the typewriter.

4. The combination of a typewriter having a platen carriage and a platen mounted therein, acylindrical basket revolving around a horizontal axis and arranged above the platen carriage of the typewriter, said basket comprising type bars having characters different from those of the typewriter, the type bars being radially arranged in the basket, a key centrally arranged in the basket, and means operatively connected to the key to cause the lowest type bar to be moved to strike the platen in printing position, the type bars being elongated at their outer ends so that, upon operation of a type bar, the prolongation enters the usual guide piece which is arranged close to the printing point of the typewriter.

KARL DIETRICH. 

